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9966 Anatomy

A 58-year-old postmenopausal woman is diagnosed with carcinoma of the distal gastrointestinal tract. During surgery lymph nodes from the sacral, internal iliac, and inguinal lymph node groups were removed and sent for histopathologic examination. The pathology report revealed positive cancerous cells only at the inguinal lymph nodes. Which of the following parts of the gastrointestinal tract were most likely affected?

ACutaneous portion of anal canal
BDistal rectum
CMucosal zone of anal canal
DPectinate line of anal canal
Anatomy
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